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This code implements the most important feature of the editor in question: https://github.com/Cube9999/vi/blob/master/vax/ex_cmds.c#L45...

I'm here for viq, a fork that removes all other code to save our precious disk space.

Nice. Yes if you want to make your own vi, you need to start with ex. vi was originally an ex command to go into 'visual' mode.